Table 1.

Quality control results for each analytical batch.

Series no.	Blank average ng ml−1	Blank S.D., ng ml−1	Solution detection limit	Blank spike recovery, %	Sample recovery, %	NIST Oyster SRM, μgg−1	NRCC Dolt-2 SRM, μgg−1	NRCC Dorm-2 SRM, μgg−1	X-check standard, 1 ngml−1	X-check standard, 2 ngml−1
1	0.046	0.003	0.010	95	108	0.066	a		0.98	2.67
2	0.040	0.001	0.002	87	105	0.072	1.93	4.84	0.92	2.37
3	0.028	0.012	0.037	100	86	0.068	2.08	4.44	0.95	2.42
4	0.129	0.023	0.070	100	80	0.054	2.08	4.77	0.89	2.48
5	0.133	0.004	0.013	92	88	0.043	2.03	4.57	1.00	2.43
6	0.072	0.000	0.000	97	85	0.054	2.05	4.62	0.98	2.37
7	0.072	0.010	0.030	93	88	0.052	2.23	3.24	1.02	2.32
8	0.073	0.003	0.010	106	155	0.052	1.95	4.53	0.95	2.49
9	−0.019	0.035	0.104	103	91	0.095	2.55	5.15	1.05
10	−0.035	0.067	0.202	104	94	0.117	2.29	4.76	0.97
11	−0.009	0.007	0.020	101	102	0.076	2.60	5.19	0.97
Average Certified (SRMs)	0.048	0.015	0.045	98	98	0.068	2.18	4.61	0.97	2.44
						0.064 ±0.007	1.99±0.10	4.64 ±0.26

Note: ^aBlank spaces denote that the particular test was not included in the batch.